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Paper 2020/191
Lattice-Inspired Broadcast Encryption and Succinct Ciphertext-Policy ABE
Zvika Brakerski and Vinod Vaikuntanathan
Abstract
We propose a candidate Ciphertext-Policy Attribute Based Encryption (CP-ABE) scheme for circuits, with ciphertext size that depends only on the depth of the policy circuit (and not its size). This, in particular, gives us a Broadcast Encryption (BE) scheme where all parameters (in particular, the size of the keys and ciphertexts) have a poly-logarithmic dependence on the number of users, a task that was only known to be achievable assuming ideal multilinear maps or indistinguishability obfuscation. Our construction relies on techniques from lattice-based (and in particular LWE-based) cryptography, but we are unable to provide a security proof. We analyze some attempts at cryptanalysis.
Metadata
- Available format(s)
- Category
- Foundations
- Publication info
- Preprint. MINOR revision.
- Keywords
- Broadcast encryptionciphertext-policy ABElatticeslearning with errors
- Contact author(s)
- vinodv @ mit edu
- History
- 2021-04-26: revised
- 2020-02-18: received
- See all versions
- Short URL
- https://ia.cr/2020/191
- License
-
CC BY